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            <td class="headerCovTableEntry">4</td>
            <td class="headerCovTableEntry">5</td>
            <td class="headerCovTableEntryMed">80.0 %</td>
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            <td class="headerItem">Date:</td>
            <td class="headerValue">2020-09-11 22:50:33</td>
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            <td class="headerCovTableEntry">1</td>
            <td class="headerCovTableEntry">1</td>
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<pre class="sourceHeading">          Line data    Source code</pre>
<pre class="source">
<a name="1"><span class="lineNum">       1 </span>            : #ifndef BOOST_SMART_PTR_ENABLE_SHARED_FROM_THIS_HPP_INCLUDED</a>
<span class="lineNum">       2 </span>            : #define BOOST_SMART_PTR_ENABLE_SHARED_FROM_THIS_HPP_INCLUDED
<span class="lineNum">       3 </span>            : 
<span class="lineNum">       4 </span>            : //
<span class="lineNum">       5 </span>            : //  enable_shared_from_this.hpp
<span class="lineNum">       6 </span>            : //
<span class="lineNum">       7 </span>            : //  Copyright 2002, 2009 Peter Dimov
<span class="lineNum">       8 </span>            : //
<span class="lineNum">       9 </span>            : //  Distributed under the Boost Software License, Version 1.0.
<span class="lineNum">      10 </span>            : //  See accompanying file LICENSE_1_0.txt or copy at
<span class="lineNum">      11 </span>            : //  http://www.boost.org/LICENSE_1_0.txt
<span class="lineNum">      12 </span>            : //
<span class="lineNum">      13 </span>            : //  http://www.boost.org/libs/smart_ptr/enable_shared_from_this.html
<span class="lineNum">      14 </span>            : //
<span class="lineNum">      15 </span>            : 
<span class="lineNum">      16 </span>            : #include &lt;boost/smart_ptr/weak_ptr.hpp&gt;
<span class="lineNum">      17 </span>            : #include &lt;boost/smart_ptr/shared_ptr.hpp&gt;
<span class="lineNum">      18 </span>            : #include &lt;boost/assert.hpp&gt;
<span class="lineNum">      19 </span>            : #include &lt;boost/config.hpp&gt;
<span class="lineNum">      20 </span>            : 
<span class="lineNum">      21 </span>            : namespace boost
<span class="lineNum">      22 </span>            : {
<span class="lineNum">      23 </span>            : 
<span class="lineNum">      24 </span>            : template&lt;class T&gt; class enable_shared_from_this
<span class="lineNum">      25 </span>            : {
<span class="lineNum">      26 </span>            : protected:
<span class="lineNum">      27 </span>            : 
<span class="lineNum">      28 </span>            :     enable_shared_from_this() BOOST_NOEXCEPT
<span class="lineNum">      29 </span>            :     {
<span class="lineNum">      30 </span>            :     }
<span class="lineNum">      31 </span>            : 
<span class="lineNum">      32 </span>            :     enable_shared_from_this(enable_shared_from_this const &amp;) BOOST_NOEXCEPT
<span class="lineNum">      33 </span>            :     {
<span class="lineNum">      34 </span>            :     }
<span class="lineNum">      35 </span>            : 
<span class="lineNum">      36 </span>            :     enable_shared_from_this &amp; operator=(enable_shared_from_this const &amp;) BOOST_NOEXCEPT
<span class="lineNum">      37 </span>            :     {
<span class="lineNum">      38 </span>            :         return *this;
<span class="lineNum">      39 </span>            :     }
<span class="lineNum">      40 </span>            : 
<span class="lineNum">      41 </span>            :     ~enable_shared_from_this() BOOST_NOEXCEPT // ~weak_ptr&lt;T&gt; newer throws, so this call also must not throw
<span class="lineNum">      42 </span>            :     {
<span class="lineNum">      43 </span><span class="lineNoCov">          0 :     }</span>
<span class="lineNum">      44 </span>            : 
<span class="lineNum">      45 </span>            : public:
<span class="lineNum">      46 </span>            : 
<span class="lineNum">      47 </span>            :     shared_ptr&lt;T&gt; shared_from_this()
<span class="lineNum">      48 </span>            :     {
<span class="lineNum">      49 </span>            :         shared_ptr&lt;T&gt; p( weak_this_ );
<span class="lineNum">      50 </span>            :         BOOST_ASSERT( p.get() == this );
<span class="lineNum">      51 </span>            :         return p;
<span class="lineNum">      52 </span>            :     }
<span class="lineNum">      53 </span>            : 
<span class="lineNum">      54 </span>            :     shared_ptr&lt;T const&gt; shared_from_this() const
<span class="lineNum">      55 </span>            :     {
<span class="lineNum">      56 </span>            :         shared_ptr&lt;T const&gt; p( weak_this_ );
<span class="lineNum">      57 </span>            :         BOOST_ASSERT( p.get() == this );
<span class="lineNum">      58 </span>            :         return p;
<span class="lineNum">      59 </span>            :     }
<span class="lineNum">      60 </span>            : 
<span class="lineNum">      61 </span>            :     weak_ptr&lt;T&gt; weak_from_this() BOOST_NOEXCEPT
<span class="lineNum">      62 </span>            :     {
<span class="lineNum">      63 </span>            :         return weak_this_;
<span class="lineNum">      64 </span>            :     }
<span class="lineNum">      65 </span>            : 
<span class="lineNum">      66 </span>            :     weak_ptr&lt;T const&gt; weak_from_this() const BOOST_NOEXCEPT
<span class="lineNum">      67 </span>            :     {
<span class="lineNum">      68 </span>            :         return weak_this_;
<span class="lineNum">      69 </span>            :     }
<span class="lineNum">      70 </span>            : 
<span class="lineNum">      71 </span>            : public: // actually private, but avoids compiler template friendship issues
<a name="72"><span class="lineNum">      72 </span>            : </a>
<span class="lineNum">      73 </span>            :     // Note: invoked automatically by shared_ptr; do not call
<span class="lineNum">      74 </span><span class="lineCov">          2 :     template&lt;class X, class Y&gt; void _internal_accept_owner( shared_ptr&lt;X&gt; const * ppx, Y * py ) const</span>
<span class="lineNum">      75 </span>            :     {
<span class="lineNum">      76 </span><span class="lineCov">          2 :         if( weak_this_.expired() )</span>
<span class="lineNum">      77 </span>            :         {
<span class="lineNum">      78 </span><span class="lineCov">          2 :             weak_this_ = shared_ptr&lt;T&gt;( *ppx, py );</span>
<span class="lineNum">      79 </span>            :         }
<span class="lineNum">      80 </span><span class="lineCov">          2 :     }</span>
<span class="lineNum">      81 </span>            : 
<span class="lineNum">      82 </span>            : private:
<span class="lineNum">      83 </span>            : 
<span class="lineNum">      84 </span>            :     mutable weak_ptr&lt;T&gt; weak_this_;
<span class="lineNum">      85 </span>            : };
<span class="lineNum">      86 </span>            : 
<span class="lineNum">      87 </span>            : } // namespace boost
<span class="lineNum">      88 </span>            : 
<span class="lineNum">      89 </span>            : #endif  // #ifndef BOOST_SMART_PTR_ENABLE_SHARED_FROM_THIS_HPP_INCLUDED
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